ARCHIVED REPORTS_XR0007195 - Laserfiche WebLink

Home Browse Search

I14 June 2001 AGE-NC Project No 98-0505 IPage 3 of 5 ' 3 1 GROUND WATER ELEVATION AND GRADIENT The average ground water elevation of the seven shallow ground water monitoring wells on 15 May ' 2001 was approximately 11 15 feet below mean sea level (msl), with the average depth of water at 18 8 feet below casing tops The ground water table occurred within the screened intervals of wells MW-7 and MW-8 During the May monitoring event,ground water was between 9 99 and 11 51 feet ' above the screened intervals in monitoring wells MW-1 through MW-5 Therefore, the five ground water monitoring wells were "drowned", and may not have yielded samples fully representative of ground water conditions near the top of the saturated zone where fuel hydrocarbons would be expected to have the greatest impact The ground water table occurred approximately 41 feet above the screened interval of the deep well MW-6 Based on data collected during the May 2001 ground water monitoring event, the gradient was inferred to be 0 002 ft/ft (Figure 3) near the former UST area Ground water flow direction was generally toward the east-southeast �. 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES Monitoring wells MW-2 through MW-8 were sampled on 15 May 2001,MW-1 was sampled on 16 May 2001 The analytical results of the ground water samples were as follows • TPH-g was detected in ground water samples collected from monitoring wells MW-1, I MW-2, MW-3, MW-4, MW-6, MW-7 and MW-8 TPH-g concentrations ranged from 57 micrograms per liter(µg/1)in MW-4 to 100,000 µg/1 in MW-1 Benzene was detected in the ground water samples collected from monitoring wells MW-1,MW-2,MW-3 and MW-6 at concentrations ranging from 2 7µg/1(MW-2)to 7,900µg/l(MW-1) Toluene was detected in monitoring wells MW-1,MW-2,MW-3,MW-4 and MW-6 at concentrations ranging from 1 2 µg/1 (MW-4) to 22,000 µg/1 (MW-1) Ethylbenzene was detected in samples collected from MW-1,MW-2, MW-3 and MW-6 at concentrations ranging from 1 3 µg/1 (MW-2) to 2,500 gg/1(MW-1) Total xylenes were detected in samples collected from monitoring wells MW-1, MW-2, MW-3 and MW-6 at concentrations ranging from 3 2 µg/1 (MW-2) to 11,000 µg/1 (MW-1) • DIPE was detected in the sampled analyzed from MW-8 at a concentration of 1 2 gg/1 TBA was detected in the sampled analyzed from MW-7 at a concentration of 22 µg/1 MTBE, ETBE and TAME were not detected in the ground water samples collected from the site • 1,2-DCA was detected in ground water samples collected from MW-1, MW-2, MW-3, IMW-5,MW-6,MW-7 and MW-8 Concentrations ranged from 4 2 µg/1(MW-5)to 410 µg/l • (MW-1) EDB was not detected in any of the groundwater samples collected during the May 2001 monitoring event Advanced GeoEnviranmental,Inc